摘要:
A process for preparing 2-cyano-3,3-diarylacrylic esters of the general formula I ##STR1## where R.sup.1 and R.sup.2 are hydrogen, C.sub.1 -C.sub.12 -alkyl groups, C.sub.- C.sub.12 -alkoxy groups or di(C.sub.1 -C.sub.4 -alkyl)amino groups and R.sup.3 is a C.sub.4 -C.sub.18 -alkyl group which can be interrupted by ether-functional oxygen atoms, by reacting a benzophenone imine of the general formula II ##STR2## with a cyanoacetic ester of the general formula III ##STR3## wherein the reaction is carried out at from 20 to 60.degree. C. and, during this, the liberated ammonia is continuously removed from the reaction mixture with the aid of a stream of gas or by reducing the pressure to from 900 to 100 mbar.
摘要:
A process for preparing benzophenone imines of the general formula I ##STR1## where R.sup.1 to R.sup.6 are hydrogen, C.sub.1 -to C.sub.4 -alkoxy, C.sub.1 -to C.sub.2 -alkylamine or C.sub.2 -to C.sub.4 -dialkylamine, by reacting benzophenones of the general formula II ##STR2## where R.sup.1 to R.sup.6 have the abovementioned meanings, in liquid ammonia in the presence of oxides of the elements boron, aluminum, gallium, indium, silicon, germanium, tin, lead, phosphorus, arsenic, antimony, bismuth, scandium, yttrium, titanium, zirconium, vanadium, niobium, tantalum or mixtures thereof at from 50.degree. to 150.degree. C. and from 50 to 350 bar is described.
摘要:
Novel 2-cyanoacrylic esters I ##STR1## where the radicals have the following meanings: R.sup.1 and R.sup.2 are each hydrogen or a radical having an iso- or heterocyclic ring system with at least one iso- or heteroaromatic nucleus, and at least one of the radicals R.sup.1 or R.sup.2 must be different from hydrogen, n is from 2 to 10, and X is, when n=2, a radical of the formula II ##STR2## where m is from 2 to 8, and X is, when n>2, the radical of an n-hydric aliphatic or cycloaliphatic polyol having 3-20 carbon atoms, it also being possible for a cycloaliphatic radical to contain 1 or 2 hetero atoms, and for an aliphatic radical to be interrupted by up to 8 non-adjacent oxygen atoms, sulfur atoms, imino or C.sub.1 -C.sub.4 -alkylimino groups, are used as light stabilizers.
摘要:
The use of 3-arylacrylic esters I ##STR1## where Ar is an aryl radical which can additionally carry substituents, R.sup.1 is the residue of an n-hydric aliphatic polyol having up to 20 carbon atoms, where the carbon chain can be interrupted by up to 9 non-adjacent oxygen atoms, or of an n-hydric cyclo-aliphatic polyol having 5 to 20 carbon atoms in which ring carbon atoms can also be replaced by non-adjacent oxygen atoms, R.sup.2 and R.sup.3 are hydrogen or C.sub.1 --C.sub.4 -alkyl, and n is a number from l to 10, as stabilizers, in particular against the action of light, for non-living organic material.
摘要:
A sunscreen-containing cosmetic formulation to protect the human epidermis from UV light in the range from 280 to 400 nm, which formulation includes a cosmetically suitable carrier, together with compounds which absorb in the UV-B region and as photostable UV-A filters effective amounts of compounds of the formula I as defined in the specification.
摘要:
Mixtures contain(A) vinyl-containing monomers, and(B) an effective amount of a mixture inhibiting the premature polymerization of the vinyl-containing monomers during the purification or distillation and containing(i) from 0.05 to 4.5% by weight, based on the total mixture (B), of at least one N-oxyl compound of a secondary amine which carries no hydrogen atoms on the .alpha.-carbon atoms and(ii)from 99.95 to 95.5% by weight, based on the total mixture (B), of at least one nitro compound,and a mixture (B) is used for inhibiting the premature polymerization of monomers.
摘要:
A process for compressing ethylenically unsaturated monomers at a pressure of 200-5000 bar in the absence of a polymerization initiator comprises carrying out compression in the presence of a sterically hindered amine derivative.
摘要:
A method of using compounds of formula I ##STR1## in which the C.dbd.C double bond is present in E and/or Z configuration and the variables R.sup.1, R.sup.2, R.sup.3 and R.sup.4 have the meanings defined in the specification disclosure, as UV filters, particularly UV-A filters, in cosmetic and pharmaceutical formulations for the protection of the human skin or human hair from solar radiation, alone or together with compounds known per se in cosmetic and pharmaceutical formulations and capable of absorbing radiation in the UV range.
摘要:
N,N'-bridged bistetramethylpiperidinyl compounds of Formula I ##STR1## useful as light stabilizers and stabilizers for organic material which are prepared starting from tetramethylpiperidinyl compounds of Formula II ##STR2## by reacting a compound of Formula II with a cyclic carbonate of Formula III. ##STR3##
摘要:
A monomer composition is described, containing A) vinyl-containing monomers in which the vinyl bears a hetero-atom selected from the group consisting of the halogens, nitrogen, oxygen, sulfur or silicon, andB) at least one N-oxyl compound of a secondary amine which does not bear hydrogen on the .alpha.-carbons, in an amount effective as stabilizer against premature polymerization.